Isobutanol Production Using Metabolically Engineered Escherichia Coli

Tech ID: 30043 / UC Case 2007-394-0

Summary

UCLA researchers at the Department of Chemical and Biomolecular Engineering have engineered Escherichia coli bacteria to produce isobutanol from glucose.

Background

The production of fuel substitutes such as bioalcohols and biodiesel from renewable resources present promising commercial opportunities as replacements to fossil fuels. Currently, ethanol is the major form of biofuel. However, bioethanol has several significant drawbacks including low energy density and incompatibility with existing fuel infrastructure. Advanced biofuels such as C3-C5 alcohols and isoprenoids are believed to circumvent these problems. However, these advanced biofuel compounds are not commonly produced naturally in quantities capable of support large-scale use. Development of simple, efficient methods of producing advanced biofuels will be essential to the viability of large-scale biofuel use.

Innovation

Dr. James Liao and colleagues have engineered E. coli bacteria to efficiently produce C4 alcohol isobutanol from glucose. The genetically engineered strain expresses a combination of recombinant genes from E. coli, B. subtilis and S. ceravisae to efficiently produce isobutanol from carbon sources such as glucose. In addition, genes involved in byproduct formation have been deleted in order to increase the isobutanol yield. The engineered strain produces isobutanol in large quantities (20g/L isobutanol) and is highly efficient (yield of 86% of the theoretical maximum). The production of isobutanol in such large quantities demonstrates the potential of this pathway and opens the possibility of industrial production of this compound.

Applications

  • Production of isobutanol for biofuel use

Advantages

  • E. coli is easy to grow and maintain 
  • Isobutanol has a high octane number 
  • Isobutanol has a similar energy level to gasoline

State Of Development

Demonstrated isobutanol production in engineered E.coli strain to be 86% of theoretical max (20g/L).

Related Materials

  • Atsumi S., Wu T.Y., Eckl E.M., Hawkins S.D., Buelter T., and Liao J.C., Engineering the isobutanol biosynthetic pathway in Escherichia coli by comparison of three aldehyde reductase/alcohol dehydrogenase genes. Applied Microbiology and Biotechnology. 2010 Jan;85(3):651-7.
  • Atsumi S., Hanai T., and Liao J.C. Non-fermentative pathways for synthesis of branched-chain higher alcohols as biofuels. Nature. 2008. volume 451, pages 86–89
  • Asumi S., Cann A.F., Connor M.R., Shen C.R., Smith K.M., Brynildsen M.P., Chou K.J., Hanai T., and Liao J.C. Metabolic engineering of Escherichia coli for 1-butanol production. Metabolic Engineering. 2008 Nov;10(6):305-11.

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 9,695,426 07/04/2017 2007-394
United States Of America Issued Patent 9,416,378 08/16/2016 2007-394
United States Of America Issued Patent 8,975,049 03/10/2015 2007-394
Mexico Issued Patent 303600 09/20/2012 2007-394
 

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Inventors

  • Liao, James C.

Other Information

Keywords

Biofuels, E. coli, genetic engineering, isobutanol, bioenergy, hydrocarbons, bioalcohols, renewable energy

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